Langer's Sudoku Assistant

Invalid Sudoku!

Row 1 is invalid. Column 4 is invalid. The bottom center 3x3 Box is invalid. Go back and make a different choice.

 

1
9
1
7
6
2
3
8
5
5
6
      3
4      
   8   
9
      3
4      
   8   
      3
4      
   8   
7
1
2
7
8
2
3
1
5
4
6
9
1
7
9
5
2
4
6
3
8
2
8
3
6
9
1
4
5
7
6
5
4
8
3
7
2
9
1
2
       
   5   
   8   
7
9
       
   5   
   8   
3
4
1
6
1
3
9
1
7
6
8
2
5
1      
   5   
       
4
6
1      
   5   
       
2
8
9
7
3

 

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